Hai..guys. I had successfully simulated my thd with .four . My thd is around 0.03 which is almost the same with the manufacture datasheet. I had simulated my IMD. But I had problem on how to determine the value of my IMD. I inserted a series voltage supplies , 9.5KHz and 10.5KHz in my Vin. Both of my sidebandsi amplitude is below -100db. My amplitude in the graph at 9.5KHz and 10.5Hz are both -33.dB . The rest are mostly below -100db. So can I know the way to determine my IMD?